Safety device for elevators and the like



Jul 10, 1928.

J. KASPE SAFETY DEVICE FOR ELEVATORS AND THE LIKE Filed March 25, 1927 Patented July it), 1928,

JOSEPH KASPE, .OZF CHARBIN, RUSSIAQ SAFETY nnvronron nLE vAToBs Amman Application filed March 25, 1927, Serial so.

This invention relates to safety devices for elevators and the like and is an improvement on that type of safety devices in which, on

the occurrence of a stretch or break in the hoisting cable, brakes or the like'are caused to grip the guide rails and bring the elevator to a stop. f V

One object of my invention is to provide a safety device of the class referredto, which shall combine smoothness and reliability of action with cheapness of production and ease of control and supervision. Another object is the provision of means which will give warning of a stretch in the hoisting ca- 7 bio and to enable, to some extent, a'compensation ot the slack by 'an adjustment of the safety device without thereby impairing the I amount of safety.

lVIy invention mainly consists in the provision, apart from the hoisting cable, of a normally untensioned auxiliary cable in con- 7 nection with a wedge piece on the elevator,

and of special breaking means adapted to be' operated by the said wedge piece so as to grip the guide rails with gradually increasiug pressure.

The accompanying invention by way of example:

Fig. 1 shows the brake actuating Wedge and connected parts part-sectional side' elevation. i

Fig. 2 is a side elevation of the counter weight. 7

,Fig. 3 is a section on line TIL-III of V Fig 4 illustrates the means for regulating the length of the cables.

' Fig. 5 is a section through the rope pulileys for the hoisting and the auxiliarycables. a i e p The cabin or platform of the elevator cari'ries at its top a casing a in which ado'uble sided wedge piece 12' is arranged. This wedge piece is provided with two passages 0 through which the hoisting ropes or cables '0 are loosely passed to be connected in known manner with the body of the elevator, I

and with t-wo'vfurther passages d in which the ends of an auxiliary rope or cable at are secured. The hoisting cable and the auxiliary cable are led in the usual manner over rope pulleys 0, p, at the top of the elevator frame, which pulleys are mounted on a driving shaft 9. The pulleys 0 for the hoisting cable are fast while the pulleys for the auxiliary cable are mounted loosely on drawings illustrate the the said shaft; Both cable pass over these "pulleys to grooved blocks 0 and '2' respec tively of the counterweight 'Z', whence they are returned andagainpassed over the said pulleys back'to the elevator piece respectively. 7 V

I It now for any reason stretching of; the hoisting cable; or a break'should occur, the down movement of the elevator would cause the wedge piece to'ris'e in relation to the car reason of its 'beingin connection with the counter-weight by the auxiliary cable cl. Hereby the wedge lpie'ce j'ams itselfbetween the rollers of the tongue-like pivoted brake lcverse forcing them apart and thereby pressing the brake shoes dgradually but: tightlyagainst the guide rails or bars 7" until the elevatorcomes to a stop. Springe tends to draw the brake levers towards each other and to' normally keep the brake or the wedge shoes out of engagement with the'bars ing cable bymeans of a regulating 'device,"

which will be referred to at a later'stageof this specification. I v a In the case of a stop by reason of a break of the hoisting cableflof the, elevator, the

latter is heldfnotonly by the action of the brake shoes but by the auxiliarycable d also, which now has changed fromthe untensioned int o the tensioned condition. This cable enablesthe elevator with its load to be moved to the next floor by turning down the bolt 9 thereby lowering the'wedge piece 5' and releasing the brakes accordingly. Even in such cases in which under some ,adverselconditions the emergency'brake' e, e

shouldnot work to its full advantage, the

cable d would give asufiicie nt amount oif satety aga'instaccident. The, fact of the auxiliary cable running oventheilooserope pulleys 7) on the-driving sh aft prevents its being placed. under strain, as long as the 3 hoisting cable is workingorder, n The device for' regulating the length of the cables as illustrated in Fig; 4 permits,

contrary to the known arrangements, an ex-' act observation of any'stretch which may;

have occurred in the hoisting cable and thus constitutes a means for at all times ascertaining the working condition of the cable. According to the drawing Fig. 4% the block the invention as defined in. and by the following claims.

l/Vhat I claim is 1; The combination with an elevator and guide rails for the said elevator, of a hoisting cable attached to the elevator, an auxiliary cable. normally untensioned, a wedge piece carried by the elevator andcapable of relative movement thereto, said wedge piece belngsuspended from the counterweight by 'ineans of an auxiliary cable, tongue-like pivoted brake levers having brake shoes gripping loosely around the guide rails and extending with their inner ends near the apex 7 of the wedge piece, means to suspend a Conn terwei ht from the hoisting cableand adjustabl e means in" connection therewith to which the auxiliary cable and the wedge piece are connected, the Wedgepiece being caplication pable in case ofa stretch in thehoisting cable to move'upwardly in relation to the elevator and tofor'ce the. free ends-of each pair of brake levers apart so as to cause the ap of the brake shoes to the guide rails. V

2.. In an elevator a safety device comprising a wedge piece suspended from thecoun- 'terweight by means of an auxiliary cable, one or more sets of brake levers in co-operati've relation to the said wedge piece, and means to vary the position of the wedge piece inrelation tothe said brake levers. 3. InZan elevator a safety device comprisng a wedge piece movable in relation to the elevator andsuspended from an auxiL ,iary cable at-tached to the counterweight,

brake levers adapted with their brake shoes to gri'p the vpniide rails of the elevator at the occurrence oi a stretch or break in the hoisting cable, a'regu'lating screw to lower the wedge piece after it has risen into its brake operating position by the occurrence of a stretch or break in the hoisting cable.

4:. In anelevator a safety devicecomprisng a wedg'e piece loosely suspended from the counterweight by means of an auxiliary cable, a suspension block on the counterweight for the attachment of the hoisting cable, another suspension block for the auxiliary cable carried by the first named suspension block and adjustably connected thereto, a set of pivoted tongue-like brake levers adapted to be operated'by an upward movement of the wedge piece in relation to the elevator at the occurrence of astretch in the hoisting cable. 5. In an elevator. a safety device comprising a wedge piece suspended from the counterweiglit by means of, an auxiliary cable, a 7

suspension block on the counterweight, for the attachment of. the hoisting cable, another suspension block for the auxiliary cable carried by the first sus )ension block,

screwable means to connect t ie second suspension block to the first SUSPEIlSlOlIblOOk, one or more sets of tongue-like pivoted brake levers adapted to be operated by an upward weig t and back to the elevator over another driving ulley, an auxiliary cableattached with boti its ends to the wedge piece and passing over, loose, pulleys toua second cable block on the counterweight, the said secondcable block being carried by the cable block, means to vary the distance between the two cable blocks, tongue-like" pivoted brake levers having their brake shoesadapted to grip aroundthe guide rails of tlieielevator, and rollers on the free ends of the brake levers in close proximity to the apex of the said wedge piece so as to 'be i orced apart when the latter ascends in; relation to the elevator at the occurrence of a Stretch or break in the. hoisting cable.

n a safety device for elevators as claimed in'claim 4, a regulatinglscrew on the Wedge piece accessib'lc vfrom withoutand by means of Whichthe position of the wedge piece on the elevator may be raised or lowered. v

In witness whereof I afiix my signature.

7 aosiirn KASPEn 

